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Other Current and Non-current Liabilities - Summary of Other Current Liabilities (Parenthetical) (Detail) - 12 months ended Dec. 31, 2017 $ in Millions, $ in Millions	MXN ($)	USD ($)
Subclassifications of assets, liabilities and equities [abstract]
Income tax penalty imposed	$ 491	$ 25

X

- Definition

Fines and penalty expense.

+ References

No definition available.

+ Details

Name:	cx_FinesAndPenaltyExpense
Namespace Prefix:	cx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	ifrs-full_SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration